New polymeric heterolayer systems for efficient light-emitting devices

Sigurd K. Schrader; Walter Riess; Horst Vestweber; Norbert Koch

doi:10.1117/12.332612

16 December 1998 New polymeric heterolayer systems for efficient light-emitting devices

Sigurd K. Schrader, Walter Riess, Horst Vestweber, Norbert Koch

Proceedings Volume 3476, Organic Light-Emitting Materials and Devices II; (1998) https://doi.org/10.1117/12.332612
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

Efficiency of organic light emitting devices can be increased by separating the zones of exciton recombination from the electrodes by the insertion of additional organic layers which act as protecting - and as hole or electron blocking layers. We realized such polymer hetero-layer structures by combination of hole transporting and emitting materials like polyparaphenylenevinylene (PPV) or its derivatives with new electron transporting materials, i.e. heterocyclic polymers and heterocyclic low molecular compounds, especially phenyl quinoxalines. Current-voltage molecular compounds, especially phenyl quinoxalines. Current-voltage and current-luminance characteristics were used to study the prepared heterolayer devices. Optical spectroscopy as well as UV photoelectron spectroscopy were used to characterize the electronic structure of the individual materials. Quantum chemical calculations completed the spectroscopic studies and supported the interpretation of experimental findings. Double layers made of PPV and polyphenylquinoxaline (PPQ) are characterized by low onset voltages of about 2.2 V, high efficiency, and high brightness reaching values of more than 2000 cd/m² at a driving voltage of 10 V. The experimental findings show that PPQs are promising materials for organic electroluminescence applications.

Citation Download Citation

Sigurd K. Schrader, Walter Riess, Horst Vestweber, and Norbert Koch "New polymeric heterolayer systems for efficient light-emitting devices", Proc. SPIE 3476, Organic Light-Emitting Materials and Devices II, (16 December 1998); https://doi.org/10.1117/12.332612

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